useLatest

React state hook that returns the latest state as described in the React hooks FAQ.

This is mostly useful to get access to the latest value of some props or state inside an asynchronous callback, instead of that value at the time the callback was created from

Usage

Live Editor

function Demo() {
  const [count, setCount] = useState(0);
  const latestCount = useLatest(count);
  const handleAlertClick = () => {
    setTimeout(() => {
      alert(`Latest count value: ${latestCount.current}`);
    }, 3000);
  };

  return (
    <div>
      <p>You clicked {count} times</p>
      <button onClick={() => setCount(count + 1)}>Click me</button>
      <button onClick={handleAlertClick}>Show alert</button>
    </div>
  );
};

Result

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API

useLatest

Returns

React.MutableRefObject<T>: ref object

Arguments

Argument	Description	Type	DefaultValue
value	tracked value	T (Required)	-